Journal
VETERINARY MICROBIOLOGY
Volume 219, Issue -, Pages 161-164Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.vetmic.2018.04.002
Keywords
Colistin resistance; mcr-1; mcr-1.3; Enterobacteriaceael; Environment
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Funding
- National Key Research and Development Program of China [2016YFD0501304, 2016YED0501305]
- National Natural Science Foundation of China [31672604, 81661138002]
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The colistin resistance gene mcr-1 has been detected in multiple members of Enterobacteriaceae family. Here, we report the emergence of mcr-1 in Providencia alcalifaciens and a mcr-1 variant, named mcr-1.3, in Raoultella planticola. Both of the mcr-1-carrying plasmids in these two isolates belong to IncI2 type of plasmids, but they are different in sizes and genetic characteristics. We also detected the mcr-1 gene in one Enterobacter cloacae isolate, however, the mcr-1-carrying plasmid is distinct from the previous reports. Conjugation assay showed that mcr-1-carrying plasmids in P. alcalifaciens and E. cloacae were successfully transferred into recipient E. coli strains. It is worth noting that the transferability of mcr-1-carrying plasmid from E. cloacae was enhanced once it entered into E. coli hosts, which might further accelerate the dissemination of mcr-1 among Enterobacteriaceae. These findings further expand our knowledge of the mcr-1-carrying species in Enterobacteriaceae.
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